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Wheels first as rotational weight is most important and you can save 100g with a proper tube selection alone.Cranks (Rotational weight)Handlebar/Stem (Front end handling becomes lighter)Seatpost/Calipers (Dead weight)Pedals (rotational)Saddle (dead weight)Group (As a whole will be lighter as you upgrade).

As above plus some smaller bits and pieces, some specific to Cannondale:

1. If your ride came with the nice aluminum "Cannondale" bar end plugs ditch them for plastic -> ~20g2. Swap out the heavy FSA fork expander for the new "Evo" one -> ~35g3. Swap out the heavy cone spacer for a ControlTech -> ~30g4. Swap the stock seatpost collar for something lighter - lots of choices here -> ~15g

mellowJohnny wrote:As above plus some smaller bits and pieces, some specific to Cannondale:

1. If your ride came with the nice aluminum "Cannondale" bar end plugs ditch them for plastic -> ~20g2. Swap out the heavy FSA fork expander for the new "Evo" one -> ~35g3. Swap out the heavy cone spacer for a ControlTech -> ~30g4. Swap the stock seatpost collar for something lighter - lots of choices here -> ~15g

All told roughly 100g with those four simple changes.

All very good points but minimal savings in the grand scheme of things. For me I'd be looking at tyres, stem, bars and group for the largest savings, providing your new wheels are decent weight.

EDIT: Thinking about it, the stem and bars on the Caad 9 aren't too heavy as far as alu parts go. But tyres and group (particularly cranks, as mentioned previously) will definitely give you big savings.

Lightweight tubes are the cheapest part swap to save weight, by far. Find some thin butyl tubes like specialized turbos, etc. Those tires probably have wire beads. don't go for the lightest replacement, I'm personally a fan of gp4000s as an excellent all-rounder in the 200ish gram category. Saddle: lightest version of what best works for you. Maybe a Thomson Masterpiece post. Then you get some dwindling returns...

alexh wrote:All very good points but minimal savings in the grand scheme of things. For me I'd be looking at tyres, stem, bars and group for the largest savings, providing your new wheels are decent weight.

EDIT: Thinking about it, the stem and bars on the Caad 9 aren't too heavy as far as alu parts go. But tyres and group (particularly cranks, as mentioned previously) will definitely give you big savings.